package com.atguigu.java1;

import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 *      实现TCP的网络编程
 *          例子1：客户端发送信息给服务端，服务端将数据显示在控制台上
 *
 *
 * @author : leimingchao
 * @date Date : 2021年09月05日 0:03
 */
public class TCPTest1 {



    /**
     * 客户端
     */
    @Test
    public void client() {

        Socket socket = null;
        OutputStream outputStream = null;
        try {
            //1.创建Socket对象，指明服务器端的IP和端口号
            InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
            socket = new Socket(inetAddress,8899);
            //2.获取一个输出流，用于输出数据
            outputStream = socket.getOutputStream();
            //3.写出数据的操作
            outputStream.write("你好，我是客户端mm".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4.资源的关闭
            if (outputStream != null) {

                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 服务端
     */
    @Test
    public void server() {

        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream inputStream = null;
        ByteArrayOutputStream byteArrayOutputStream = null;
        try {
            //1.创建服务器端的ServerSocket，指明自己的端口号
            serverSocket = new ServerSocket(8899);
            //2.调用accept()表示接收来自于客户端的socket
            socket = serverSocket.accept();
            //3.获取输入流
            inputStream = socket.getInputStream();

            //不建议这样写，可能会有乱码
            // byte[] buffer = new byte[1024];
            //
            // int len;
            //
            // while ((len = inputStream.read(buffer)) != -1) {
            //
            //     String str = new String(buffer,0,len);
            //
            //     System.out.print(str);
            // }
            //4.读取输入流中的数据
            byteArrayOutputStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[5];
            int len;
            while ((len = inputStream.read(buffer)) != -1) {

                byteArrayOutputStream.write(buffer,0,len);
            }

            System.out.println(byteArrayOutputStream);
            System.out.println("收到来自于：" + socket.getInetAddress().getHostAddress() + "的数据");

        } catch (IOException e) {
            e.printStackTrace();

        } finally {
            //5。资源关闭
            if (byteArrayOutputStream != null) {

                try {
                    byteArrayOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (inputStream != null) {

                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {

                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (serverSocket != null) {

                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}
